參數(shù)資料
型號： SP3238EEY-L/TR
廠商： Exar Corporation
文件頁數(shù)： 18/20頁
文件大?。?/td> 0K
描述： IC TXRX RS232 INTELLIGNT 28TSSOP
產(chǎn)品變化通告： Packaging Change 15/Jul/2010
標(biāo)準(zhǔn)包裝： 1,500
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 5/3
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 28-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 28-TSSOP
包裝： 帶卷 (TR)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3238E_100_020111
7
DESCRIPTION
The SP3238E device meets the EIA/TIA-232
and ITU-T V.28/V.24 communication protocols
and can be implemented in battery-powered,
portable, or hand-held applications such as
notebook or palmtop computers. The SP3238E
devices feature Exar's proprietary and patented
(U.S.-- 5,306,954) on-board charge pump cir-
cuitrythatgenerates±5.5VRS-232voltagelevels
from a single +3.0V to +5.5V power supply. The
SP3238E devices can guarantee a data rate of
250kbps fully loaded.
The SP3238E is a 5-driver/3-receiver device,
ideal for portable or hand-held applications.
The SP3238E includes one complementary
always-active receiver that can monitor an
external device (such as a modem) in shutdown.
This aids in protecting the UART or serial
controller IC by preventing forward biasing
of the protection diodes where V
CC may be
disconnected.
The SP3238E device is an ideal choice for power
sensitive designs.The SP3238E device features
AUTO ON-LINE circuitry which reduces the
power supply drain to a 1A supply current.
In many portable or hand-held applications, an
RS-232cablecanbedisconnectedoraconnected
peripheral can be turned off. Under these condi-
tions,theinternalchargepumpandthedriverswill
be shut down. Otherwise, the system automati-
cally comes online. This feature allows design
engineers to address power saving concerns
without major design changes.
THEORY OF OPERATION
The SP3238E device is made up of four basic
circuit blocks:
1. Drivers
2. Receivers
3. The Exar proprietary charge pump, and
4.
AUTO ON-LINE circuitry.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to 5.0V EIA/
TIA-232 levels with an inverted sense relative
to the input logic levels. Typically, the RS-232
output voltage swing is +5.4V with no load and
+5V minimum fully loaded. The driver outputs are
protected against infinite short-circuits to ground
without degradation in reliability. These drivers
comply with the EIA-TIA-232-F and all previous
RS-232 versions.
The drivers can guarantee a data rate of 250kbps
fully loaded with 3k in parallel with 1000pF,
ensuring compatibility with PC-to-PC communi-
cation software. All unused drivers inputs should
be connected to GND or V
CC.
The slew rate of the driver output is internally
limited to a maximum of 30V/s in order to meet
theEIAstandards(EIARS-232D2.1.7,Paragraph
5). The transition of the loaded output from HIGH
toLOWalsomeetsthemonotonicityrequirements
of the standard.
Figure 7 shows a loopback test circuit used to
test the RS-232 drivers. Figure 8 shows the test
results of the loopback circuit with all five drivers
active at 120kbps with typical RS-232 loads in
parallel with 1000pF capacitors. Figure 9 shows
the test results where one driver was active
at 250kbps and all five drivers loaded with an
RS-232 receiver in parallel with a 1000pF ca-
pacitor. A solid RS-232 data transmission rate
of 120kbps provides compatibility with many
designs in personal computer peripherals and
LAN applications.
Figure 6. Interface Circuitry Controlled by
Microprocessor Supervisory Circuit
SP3238E
28
25
3
1
27
4
26
GND
C1+
C1-
C2+
C2-
V+
V-
VCC
0.1F
+
C2
C5
C1
+
C3
C4
+
13
14
15
VCC
2
ONLINE
SHUTDOWN
STATUS
P
Supervisor
IC
VCC
VIN
RESET
5k
24
23
22
16
21
20
18
5
6
7
8
9
11
RS-232
OUTPUTS
RS-232
INPUTS
T1IN
R1OUT
R1IN
T2OUT
R1OUT
T2IN
T3IN
T3OUT
T1OUT
R2IN
R3IN
R2OUT
R3OUT
UART
or
Serial C
TxD
RTS
DTR
RxD
CTS
DSR
DCD
RI
19
17
10
12
T4OUT
T4IN
T5IN
T5OUT
0.1F
相關(guān)PDF資料
PDF描述
VE-21H-IU-F4 CONVERTER MOD DC/DC 52V 200W
VE-21H-IU-F2 CONVERTER MOD DC/DC 52V 200W
VE-21H-IU-F1 CONVERTER MOD DC/DC 52V 200W
VE-21F-MY CONVERTER MOD DC/DC 72V 50W
ADM485JRZ-REEL7 IC TXRX RS-485 5V 5MBPS 8SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP3238EY 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver
SP3238EY/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceiver
SP3239E 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers
SP3239ECA 制造商:Exar Corporation 功能描述:
SP3239ECA-L 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*